wp-speed-optimization.php

<?php
/**
 * Plugin Name: WP Speed Optimization
 * Description: A set of performance tweaks for WordPress.
 * Author: Mahmood Saeed
 * Author URI: https://www.linkedin.com/in/mahmood-saeed/
 */

// Disable emojis
remove_action('wp_head', 'print_emoji_detection_script', 7);
remove_action('wp_print_styles', 'print_emoji_styles');

// Remove query strings
function remove_query_strings($src) {
	if(strpos($src, '?ver='))
		$src = remove_query_arg('ver', $src);
	return $src;
}
add_filter('script_loader_src', 'remove_query_strings', 15, 1);
add_filter('style_loader_src', 'remove_query_strings', 15, 1);

// Clean up WordPress head
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wlwmanifest_link');
remove_action('wp_head', 'wp_generator');

// Lazy-load images (native)
add_filter('wp_lazy_loading_enabled', '__return_true');

// Database cleanup (on activation)
register_activation_hook(__FILE__, function() {
	global $wpdb;
	$wpdb->query("DELETE FROM $wpdb->posts WHERE post_type = 'revision'");
	$wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '_transient_%'");
});